Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2015	Jun. 30, 2014
Operating Activities
Net Income (Loss)	$ (111,601)	$ (127,021)	$ 45,363
Income from discontinued operations	0	0	(32,870)
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	149,843	284,224	260,464
Asset impairment	60,413	66,996	2,588
Accretion of discount on asset retirement obligations	1,669	3,679	3,726
Deferred income taxes		(67,734)	16,551
Change in derivative fair value		156,135	103,270
(Gain) loss on sale of assets		(27,503)	131
Stock-based compensation expense		6,223	9,012
Exploration, including dry holes		6,498	1,286
Discontinued operations		0	122,199
Other, net		7,474	7,675
Net change in:
Accounts receivable		52,036	(46,884)
Inventories		(3,737)	(1,411)
Accounts payable		(15,413)	60,617
Accrued taxes/income tax receivable		790	14,949
Pension and other postretirement benefit contributions		(10,902)	(2,323)
Other current assets and liabilities		4,326	(21,868)
Net cash provided by operating activities		336,071	542,475
Investing Activities
Additions to oil and natural gas properties		(728,284)	(575,049)
Acquisitions, net of cash acquired		(46,203)	(22,114)
Proceeds from the sale of assets		393,094	217
Purchase of short-term investments		(919,000)	(191,000)
Sale of short-term investments		919,000	149,000
Discontinued operations		0	(690)
Other, net		0	69
Net cash used in investing activities		(381,393)	(639,567)
Financing Activities
Payment of dividends on common stock		(2,923)	(21,863)
Issuance of common stock	398,600	399,272	23,053
Reduction of long-term debt		0	(30,000)
Net change in credit facility		(352,000)	180,000
Tax benefit on stock compensation		631	3,763
Discontinued operations		0	(50,093)
Net cash provided by financing activities		44,980	104,860
Net increase (decrease) in cash and cash equivalents		(342)	7,768
Cash and cash equivalents at beginning of period		1,852	5,555
Cash and cash equivalents at end of period	1,510	1,510	13,323
Less cash and cash equivalents of discontinued operations at end of period	0	0	(11,807)
Cash and cash equivalents	$ 1,510	$ 1,510	$ 1,516